Alloy



UNITED STATES PATENT OFFICE.

WILLIAM D. ALLEN, OF HUNTSVILLE, ALABAMA.

ALLOY.

SPECIFICATION forming' part of Letters Patent No. 624,605, dated May 9, 1899-.

Application filed February 11, 1899.

To all whom it may concern.-

Be it known that I, WILLIAM D. ALLEN, a

citizen of the United States, residing at I-Iunts- V in various arts where such a compound is de sirable and where it can be advantageously employed.

One of the uses designed for the new compound or alloy is in connection with dental operations, the compound or alloy to this end being possessed of advantages in the direction of lightness ofweight, comparative great strength and rigidity, and is inexpensive, and is capable of being made into castings, such as dentures, which are free from flaws and other weakening defects.

The metallic compound or alloy consists of the following elements or ingredients, to wit: aluminium, platinum, and iridium. The relative proportions of these metals may vary as circumstances require; but I have found that the following proportions give good results: aluminium from ninety-six to ninetyseven and seven-eighths grains; platinum, from two to three grains; iridium, from oneeighth to two grains.

The variation in the proportion of iridium is governed by requirements as to color and rigidity-as, for instance, if an alloy very light in color is desired one-eighth of a grain of iridium will answer to give the proper result, whereas if a very hard and rigid alloy is demanded one to two grains of this metal is the proper proportion. In either .event Serial N01 705,234. (No specimens.)

froin two to three grains of platinum are em ployed, together with the stated proportion of aluminium.

The above-described metallic compound or alloy possesses advantages which render it especially valuable for use in making upper and lower complete and, partial dentures, crowns, bridges, and the like employed in dentistry, for, in addition toits comparative lightness, great strength, and rigidity, it is practically non-corrosive and Very durable. The elements or ingredients readily combine with each other and produce a compound which is low in fusion, thereby insuring economy both in the production of the compound and in the manufacture of the articles for which it is especiallydesigned to be employed.

The presence of iridium in the relative proportion of from one to two grains gives to the compound or alloy a degree of hardness and rigidity approximating that of steel and steel alloys, and with this proportion of iridium present the compound or alloy may be employed to advantage in lieu of the metal and alloys named by reason of the additional quality of lightness and of being compara-.

W. T. NORTON, ARTHUR BROWNING. 

